Meta Software Engineer interview questions

A FB HR person contacted me out of the blue directly. Everything was quick and well thought-through. It really looks like they interview tons of people a day and have an industrial interview process. After a brief HR phone chat, I was given a choice of a phone interview or a brief onsite - chose the latter.

A recruiter found my resume online and emailed me asking if I would be interested in opportunities with Facebook. We then spoke on the phone and she scheduled my first technical interview. Throughout the process the HR person was very friendly and helpful. The technical interviews were conducted using Skype and collabedit.com. They consisted mostly of algorithms and data structures questions, and a few questions about projects I had mentioned on my resume. The first two interviewers were very friendly and positive, and I felt the interviews went very well, having answered all the questions correctly. The last interview was conducted by a grumpy engineer with a thick accent who was running 15 minutes late and sounded like he didn't want to be there. Unfortunately this put me off quite a bit, and I did not perform very well in that interview, 3 days later I heard back from HR that they wouldn't be proceeding with on-site interviews in Palo Alto.